New civil nano concrete ppt

Class:TE A

Seminar On

NANO CONCRETE

Submitted By :Satyam Sopori

Under the Guidance of : Prof. Kodam Sir

JSPM’ Imperial College Of Engineeering and Research,

Wagholi, Pune

Department of Civil Engineering

Content INTRODUCTION

WHY NANOTECHNOLOGY FOR CONCRETE?

WHAT IS NANO CONCRETE?

NANO MATERIALS

NANO SILICA

BENEFITS OF NANO CONCRETE

CONCLUSION

SCOPE

REFERENCES

INTRODUCTION

• Nanotechnology is one of the most active

research areas which has wide applications in

almost all the fields.

• As concrete is most usable material in

construction industry it’s been required to improve

its quality.

• Improving concrete properties by addition of nano

particles have shown significant improvement

than conventional concrete.

Why nanotechnology for

concrete?

Improves the materials’ bulk properties.

Ability to control or manipulate materials at the

atomic scale. NANOSCALE ATTACK ON ASR (ALKALI

SILICATE REACTION)

To obtain thinner final products and faster setting

time.

Cost effectiveness.

Lowered levels of environmental contamination.

What is nano concrete?

A concrete made with portland cement particles

that are less than 500nm as a cementing agent.

Currently cement particle sizes range from a few

nano-meters to a maximum of about100 micro

meters.

NANO MATERIALS

Carbon Nanotubes.

Nano-silica.

Polycarboxylates.

CARBON NANO TUBES

Carbon nanotubes are molecular-scale tubes of

graphitic carbon with outstanding properties.

They can be several millimetres in length and can

have one “layer” or wall (single walled nanotube) or

more than one wall (multi walled nanotube).

SINGLE WALLED CARBON

NANO TUBES

MULTI WALLED CARBON NANO

TUBES

PROPERTIES

CNT are also highly flexible.

Mechanically, CNT appear to be the strongest

material.

The smaller diameters.

Stiffest and strongest fibers.

NANO SILICA

Is the first nano product that replaced the micro

silica.

Advancement made by the study of concrete at

nano scale have proved nano silica much better

than silica used in conventional concrete.

NANO

SILICA

PROPERTIES

High compressive strengths concretes ( 15 MPa and

75 MPa at 1 day; 40 MPa and 90 MPa at 28 days and 48 MPa

and 120 MPa at 120 days.)

High workability with reduced water/cement ratio.

Use of super plasticizing additives is

unnecessary.

Fills up all the micro pores and micro spaces.

Cement saving upto 35-45%.

POLYCARBOXYLATES

Polycarboxylates or polymer based concrete

admixtures are High Range Water Reducing

admixture (HRWR).

low dosage-reduce water as much as high dosage of

conventional admixtures.

Higher dosage-produce Self Compacting Concrete

(SCC).

This admixture type is very suitable for underwater

anti-washout concrete.

POLYCARBOXYLATES

RESULTS

Resistance to compression - 40 to 90MPa in 1

day.Resistance to compression from 70 a 100

MPa (or more) in 28 days.

Produces high resistance even with low addition

(1 to 1.5 % of the cements weight) and gives self

compacting characteristics with higher

proportions (2.5 %).

Meets the norms of environmental protection.

70% less use of additives as traditional silica, super

plasticizers or traditional fibres.

BENEFITS OF NANO

CONCRETE

Cessation of contamination caused by micro silica

solid particles.

Lower cost per building site.

Concrete with high initial and final compressive and

tensile strengths.

Concrete with good workability.

Cessation of super plasticizing utilization.

Cessation of silicosis risk.

CONCLUSION

Well dispersed nano particles increase the

viscosity of the liquid phase, improves the

segregation resistance and workability of the

system.

Accelerates the hydration.

Better bond between aggregates and cement

paste.

Improves the toughness,shear,tensile strength

and flexural strength of concrete.

SCOPE

If Portland cement can be formulated with nano-

size cement particles, it will open up a large

number of opportunities.

The cement will not only be more economical

than organic polymers but also will be fire

resistant.

A number of investigations have been carried out

for developing smart concrete using carbon

fibers.

This will become a reality with nano-cement because

nano-carbontubes are much more effective than

carbon fibers. The thickness of the composite can be

reduced to microns and hence flexible and smart

cement composite can be manufactured.

References

www.google.com

www.wikipedia.com

www.studymafia.org

www.pptplanet.com

www.pdfclass.com

Thanks